I REALLY like that vision. I doesn't destroy any existing neighborhoods and it does a great deal to connect downtown to the west and northwest neighborhoods.
Since the plan involves placing Front Runner below grade can we utilize either of the two depots as the intermodal hub rather than the one just built? Yes the new hub is nice but just imagine entering either depot with the magnificent old lobbies and catching your Front Runner north, south, east or west or Trax to the airport, university, bountiful, or any points south, in a state of the art boarding platform in the basement. (some Trax access could remain on the surface.
Since Gateway already exists it obviously would be difficult in that area but, I'm sure it would be manageable under 400 W, Triad SW parking lot and the north end of the ESA block(only when ESA needs to be replaced of course).
It could also be accomplished at the Rio Grande Depot with the highly underutilized area behind the depot.
You could also bring amtrak or a new regional or national HSR into the same station.
My grand vision would be to have a magnificent historic depot as the central hub of all rail travel into and out of SLC and Utah.
Yes I know it would be expensive, but I will enlist my favorite quote to assist me. "Make no little plans. They have no magic to stir men's blood...." Daniel Burnham.